Mine did the same on my '82. As Brad stated, just remove the wiper and rotate it on the splines. Remove the nut/screw on the end of the shaft, lift up the end of the wiper to remove the tension on the spring, then pull the wiper off the shaft. As Brad said, you may need a puller, but try this first...replace the nut/screw (I don't remember exactly what it looks like on the end of the shaft), but don't tighten it. Use a small hammer and tap on the nut/screw, but don't damage anything. The reason to reinstall the nut/screw a few turns is so that you don't damage the splines on the shaft with the hammer.
The arc of the wipers isn't what I would have expected and mine were sitting so low that they stopped below eye level at the top of the arc. When off, mine are now sitting a few inches up on the bottom of the glass/windshield. I would have liked to have them "parked" lower, but now the top of the arc when on is above my eye sight.
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